Joaquín's blog

A Magnetic Tunneling Junction (MTJ from now on) is a relatively simple device: it consists on a spacer, typically Aluminium Oxide or Magnesium Oxide sandwiched by two ferromagnets, as depicted in figure 1:

We are all familiar with magnets, we use them every day for different purposes (Our PC does it to store information in the hard drive, the souvenirs that stay atached in the fridge...). In this entry I am going to explain the reason why some solids show such magnetic behavior.

We hear everywhere that electrons in graphene (and some other materials) are "Dirac electrons"... but what is a Dirac electron?
It is an electron that follows the Dirac equation. Easy, right?
This statement is true, but probably not very useful, like the cartoon...